Shampoo is a common hair care product used for the removal of oils, dirt, skin particles, environmental pollutants and other contaminant particles that gradually build up in hair.
The goal is to remove the unwanted build-up without stripping out so much as to make hair unmanageable.
Shampoo, when lathered with water, is a surfacant, which, while cleaning the hair and scalp, can remove the natural oils (sebum) which lubricate the hair shaft.
Shampooing is frequently followed by conditioners which increase the ease of combing and styling.
Shampoo cleans by stripping sebum from the hair.